arch/frv/include/asm/highmem.h

   1 /* highmem.h: virtual kernel memory mappings for high memory
   2  *
   3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  * - Derived from include/asm-i386/highmem.h
   6  *
   7  * See Documentation/frv/mmu-layout.txt for more information.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14
  15 #ifndef _ASM_HIGHMEM_H
  16 #define _ASM_HIGHMEM_H
  17
  18 #ifdef __KERNEL__
  19
  20 #include <linux/init.h>
  21 #include <linux/highmem.h>
  22 #include <asm/mem-layout.h>
  23 #include <asm/spr-regs.h>
  24 #include <asm/mb-regs.h>
  25
  26 #define NR_TLB_LINES            64      /* number of lines in the TLB */
  27
  28 #ifndef __ASSEMBLY__
  29
  30 #include <linux/interrupt.h>
  31 #include <asm/kmap_types.h>
  32 #include <asm/pgtable.h>
  33
  34 #ifdef CONFIG_DEBUG_HIGHMEM
  35 #define HIGHMEM_DEBUG 1
  36 #else
  37 #define HIGHMEM_DEBUG 0
  38 #endif
  39
  40 /* declarations for highmem.c */
  41 extern unsigned long highstart_pfn, highend_pfn;
  42
  43 #define kmap_prot PAGE_KERNEL
  44 #define kmap_pte ______kmap_pte_in_TLB
  45 extern pte_t *pkmap_page_table;
  46
  47 #define flush_cache_kmaps()  do { } while (0)
  48
  49 /*
  50  * Right now we initialize only a single pte table. It can be extended
  51  * easily, subsequent pte tables have to be allocated in one physical
  52  * chunk of RAM.
  53  */
  54 #define LAST_PKMAP      PTRS_PER_PTE
  55 #define LAST_PKMAP_MASK (LAST_PKMAP - 1)
  56 #define PKMAP_NR(virt)  ((virt - PKMAP_BASE) >> PAGE_SHIFT)
  57 #define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
  58
  59 extern void *kmap_high(struct page *page);
  60 extern void kunmap_high(struct page *page);
  61
  62 extern void *kmap(struct page *page);
  63 extern void kunmap(struct page *page);
  64
  65 extern struct page *kmap_atomic_to_page(void *ptr);
  66
  67 #endif /* !__ASSEMBLY__ */
  68
  69 /*
  70  * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
  71  * gives a more generic (and caching) interface. But kmap_atomic can
  72  * be used in IRQ contexts, so in some (very limited) cases we need
  73  * it.
  74  */
  75 #define KMAP_ATOMIC_CACHE_DAMR          8
  76
  77 #ifndef __ASSEMBLY__
  78
  79 #define __kmap_atomic_primary(type, paddr, ampr)                                                \
  80 ({                                                                                              \
  81         unsigned long damlr, dampr;                                                             \
  82                                                                                                 \
  83         dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V;             \
  84                                                                                                 \
  85         if (type != __KM_CACHE)                                                                 \
  86                 asm volatile("movgs %0,dampr"#ampr :: "r"(dampr) : "memory");                   \
  87         else                                                                                    \
  88                 asm volatile("movgs %0,iampr"#ampr"\n"                                          \
  89                              "movgs %0,dampr"#ampr"\n"                                          \
  90                              :: "r"(dampr) : "memory"                                           \
  91                              );                                                                 \
  92                                                                                                 \
  93         asm("movsg damlr"#ampr",%0" : "=r"(damlr));                                             \
  94                                                                                                 \
  95         /*printk("DAMR"#ampr": PRIM sl=%d L=%08lx P=%08lx\n", type, damlr, dampr);*/            \
  96                                                                                                 \
  97         (void *) damlr;                                                                         \
  98 })
  99
 100 #define __kmap_atomic_secondary(slot, paddr)                                                      \
 101 ({                                                                                                \
 102         unsigned long damlr = KMAP_ATOMIC_SECONDARY_FRAME + (slot) * PAGE_SIZE;                   \
 103         unsigned long dampr = paddr | xAMPRx_L | xAMPRx_M | xAMPRx_S | xAMPRx_SS_16Kb | xAMPRx_V; \
 104                                                                                                   \
 105         asm volatile("movgs %0,tplr \n"                                                           \
 106                      "movgs %1,tppr \n"                                                           \
 107                      "tlbpr %0,gr0,#2,#1"                                                         \
 108                      : : "r"(damlr), "r"(dampr) : "memory");                                      \
 109                                                                                                   \
 110         /*printk("TLB: SECN sl=%d L=%08lx P=%08lx\n", slot, damlr, dampr);*/                      \
 111                                                                                                   \
 112         (void *) damlr;                                                                           \
 113 })
 114
 115 static inline void *kmap_atomic_primary(struct page *page, enum km_type type)
 116 {
 117         unsigned long paddr;
 118
 119         pagefault_disable();
 120         paddr = page_to_phys(page);
 121
 122         switch (type) {
 123         case 0:         return __kmap_atomic_primary(0, paddr, 2);
 124         case 1:         return __kmap_atomic_primary(1, paddr, 3);
 125         case 2:         return __kmap_atomic_primary(2, paddr, 4);
 126         case 3:         return __kmap_atomic_primary(3, paddr, 5);
 127
 128         default:
 129                 BUG();
 130                 return NULL;
 131         }
 132 }
 133
 134 #define __kunmap_atomic_primary(type, ampr)                             \
 135 do {                                                                    \
 136         asm volatile("movgs gr0,dampr"#ampr"\n" ::: "memory");          \
 137         if (type == __KM_CACHE)                                         \
 138                 asm volatile("movgs gr0,iampr"#ampr"\n" ::: "memory");  \
 139 } while(0)
 140
 141 #define __kunmap_atomic_secondary(slot, vaddr)                          \
 142 do {                                                                    \
 143         asm volatile("tlbpr %0,gr0,#4,#1" : : "r"(vaddr) : "memory");   \
 144 } while(0)
 145
 146 static inline void kunmap_atomic_primary(void *kvaddr, enum km_type type)
 147 {
 148         switch (type) {
 149         case 0:         __kunmap_atomic_primary(0, 2);  break;
 150         case 1:         __kunmap_atomic_primary(1, 3);  break;
 151         case 2:         __kunmap_atomic_primary(2, 4);  break;
 152         case 3:         __kunmap_atomic_primary(3, 5);  break;
 153
 154         default:
 155                 BUG();
 156         }
 157         pagefault_enable();
 158 }
 159
 160 void *__kmap_atomic(struct page *page);
 161 void __kunmap_atomic(void *kvaddr);
 162
 163 #endif /* !__ASSEMBLY__ */
 164
 165 #endif /* __KERNEL__ */
 166
 167 #endif /* _ASM_HIGHMEM_H */